Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 8, Pages 11556-11562Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.01.182
Keywords
Interface structure; Deformation mechanisms; AlN/GaN multilayer; Molecular dynamics
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Funding
- National Natural Science Foundation of China [11872014, 11932004]
- Science and Technology on Plasma Physics Laboratory [6142A04180108]
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Experimental results show that nano-ceramic/ceramic multilayers have excellent properties, and the deformation mechanisms need further investigation. In this work, molecular dynamics simulations were performed to study the interface structure of an AlN/GaN multilayer as well as the deformation mechanisms under uniform tensile/compressive loadings. After relaxation, a hexagonal misfit dislocation structure was observed at the interface. Analysis revealed that the misfit dislocation lines, surrounded by coherent regions, are of edge type. Unlike metal/metal multilayers and metal/ceramic multilayers, the stress-strain curve of the AlN/GaN multilayer subjected to in-plane loading shows only single main yield point. This is because that dislocations nucleate from the interface and emit into both layers almost simultaneously. A rhombus network was observed in GaN layer, attributed to the slip of dislocations along [11 (2) over bar0] (1 (1) over bar 00) and [2 (1) over bar(1) over bar0] (01 (1) over bar0) in wurtzite lattice structure. The tension-compression asymmetry was also found in the AlN/GaN multilayer.
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